3 years, 11 months ago.

Setting the time from a 32 bit int causes CPU lockup

I'm attempting to simply set the time from a number, but when I do, the CPU locks up (a debug session stepping into set_time just freezes). The code I'm using is:

char *TmpPoint;
time_t NewTime = strtoul(&TempData[2], &TmpPoint, 10);
set_time(NewTime);

TempData is a char array { 'T', 'M', '1', '4', '5', '1', '3', '9', '6', '7', '7', '5', '\r', '\n' } which is correctly converted into 1451396775, so I can't see why such a simple operation would lock the CPU up. Using set_time() with a static number works fine. Any ideas/suggestions or is this CPU a write off?

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What about the \r and \n are these being passed to set_time? I have had something similar, I could not see these on a printf.

posted by Paul Staron 29 Dec 2015

I would call it really unlikely that it would be a CPU writeof. Can you do printf on the NewTime var, if you didn't already do so, to see what is in it.

posted by Erik Olieman 29 Dec 2015

I don't think it's caused by a stray \r or \n, neither can be represented in an int and strtoul() stops at the first non-valid number it finds, http://linux.die.net/man/3/strtoul : 'The remainder of the string is converted to an unsigned long int value in the obvious manner, stopping at the first character which is not a valid digit in the given base.'

I printed out the number both using printf and using print from gdb, both displayed just the (valid) number and no newline characters.

posted by Bob Seque 30 Dec 2015
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